JP2009250581A - Heating and cooling system using underground heat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating and cooling system using underground heat constituted to have an underground heat space on an outer wall side of an underground building to enable heat exchange. <P>SOLUTION: In the heating and cooling system using underground heat, first steel materials 3 are mounted on the outer wall of the underground building 2 positioned in the lower part of a ground building 1, and iron plates 15 are provided astride the first steel materials 3 on ground wall sides of the first steel materials for earth retention. A space of the first steel material 3 between inner wall members 6, 7, 8 provided inside the first steel material 3 and the iron plate 15 is used as the underground heat space 10 for retaining air with underground heat. Second steel materials 4 jointed to the iron plates 15 are embedded around the underground building 2. The air including underground heat absorbed by the steel materials is circulated in a space with the ground building 1 via the underground heat space 10, so as to perform heating and cooling. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air conditioning system using geothermal heat. More specifically, the temperature of the outside air temperature and the underground temperature can be obtained without using a geothermal space inside the underground building, piles for retaining the mountain outside the underground building, etc., and drilling a new underground heat exchange well. The present invention relates to a geothermal heat-use air conditioning system capable of air-conditioning buildings using the difference.

  Cooling and heating using geothermal heat has been conventionally performed, which is known per se. The reason for using geothermal heat is that the temperature of the underground is small throughout the year, and the efficiency of air conditioning of buildings and the like can be improved by taking advantage of this feature. In general, the temperature in the ground is lower than the outside temperature in the summer, and the temperature in the ground is higher in the winter than the outside temperature. For this reason, this temperature difference can be used to use geothermal heat for cooling in summer and for heating in winter.

Conventionally, a steel pipe is driven into the ground near the ground structure, and heat is exchanged by forcibly circulating air, antifreeze liquid, etc. as a heat medium in this steel pipe, and the underground heat transmitted to the steel pipe. Is heat-collected or dissipated with a heat medium, and heat is exchanged with the air in the building to efficiently use the underground heat (see, for example, Patent Documents 1, 2, and 3). Also, a method is known in which a bellows-like or spiral heat exchange pipe is arranged in a steel pipe driven into the ground so as to perform heat exchange efficiently (for example, see Patent Document 2). On the other hand, a technique related to a geothermal heat utilization system that provides a plurality of underground heat insulating wall structures that surround the ground around the underground heat exchanger with heat insulating walls and stores heat for each period is also known (see, for example, Patent Document 4).
JP 2004-177013 A JP 2006-010098 A JP 2006-207919 A Japanese Patent Laid-Open No. 2005-337569

  A conventional geothermal heat utilization device has been a heat exchange method using a steel pipe or the like installed in the ground or a heat exchange utilizing heat transfer by a heat pipe. Conventionally, a steel pipe or the like is driven into the ground in a vertical direction to provide an underground heat exchange well or the like. If it is installed for use only for geothermal heat, it is troublesome and requires high-cost construction due to the need for construction added to ordinary buildings. In addition, the use of geothermal heat in houses, etc. involves new construction work for establishing a ground heat exchange well for geothermal heat use in a narrow site. This caused environmental problems such as vibration and noise.

  The deeper the underground, the more effective the use of underground heat, the more effective the underground heat is used. In addition, regarding heat exchange by installing a steel pipe, the conventional steel pipe configuration has a problem in terms of thermal efficiency because the heat exchange area corresponding to the diameter is not so large. For this reason, in order to heat up as much underground heat as possible, a large number of steel pipes are required to be driven into the ground. Apart from the use of geothermal heat, there are many cases where a basement is installed in the ground.

  In this case, in the past, almost no equipment using geothermal heat was used together. For example, a heat insulating material was added to the side wall for the purpose of preventing condensation. Met. Moreover, when using geothermal heat, even if there is a basement, a dedicated geothermal heat utilization device is separately installed in the vicinity of the ground building as necessary. In buildings where basements are installed, especially in underground construction where steel plates are used, the outer walls are always made of steel for earth retaining or mountain retaining in some form.

  Steel is a member having high thermal conductivity, and is characterized by being easy to heat and cool. The use of this for geothermal heat is a conventional form of using steel pipe for geothermal heat as described above, which is known. Utilizing this property effectively, it is most suitable to use not only the conventional steel pipe configuration but also all steel materials including those buried in the ground for the use of underground heat. It was sought after.

  The present invention has been made to solve the above-described problems of the prior art, and achieves the following object.

  An object of the present invention is to use a ground heat having a structure including a ground heat space in which an underground space is provided on an outer wall of an underground building and air having ground heat is retained between the hollow spaces to perform heat exchange. It is to provide an air conditioning system.

  Another object of the present invention is to effectively use piles for mountain retaining for construction of underground structures, and to construct a structure in which a heat exchanging tube is integrally provided on the pile for mountain retaining, without costly new construction. An object is to provide a geothermal heat-use air conditioning system that can be reduced.

The present invention takes the following means in order to achieve the object.
The ground heat utilization cooling and heating system of the present invention 1
A structure comprising a ground structure constructed on the ground and an underground structure installed at or below a basement of the ground structure, forms a framework of the wall of the underground structure, and conducts heat. An intermediate wall member made of a high-rate material, an outer wall member that is provided on the ground side of the intermediate wall member, holds the ground, and can conduct heat from the ground side; and the intermediate wall member Provided on the opposite side of the ground, the inner wall member constituting the wall surface of the underground building, and the intermediate wall member, sandwiched between the outer wall member and the inner wall member, and in the vicinity of the outer wall member In order to perform cooling or heating in the building by utilizing the underground heat space in which air having a temperature substantially equal to the temperature of the ground is retained and the difference between the temperature of the air in the underground heat space and the temperature of the outside air The air heat exchange device.

The ground heat utilization cooling and heating system of the present invention 2 is the present invention 1,
The ground wall of the outer wall member can be in contact with the outer wall member and extends to a position below the underground building, and is formed of a material having high thermal conductivity. The member is embedded.

The ground heat utilization air conditioning system of the present invention 3 in the present invention 1 or 2,
The air heat exchange device is a heat pump device using geothermal heat that performs cooling or heating of the interior of the building using the geothermal space as a geothermal heat exchange well.

The ground heat utilization air conditioning system of this invention 4 in this invention 1 or 2,
The air heat exchange device is a blower that moves the air in the underground heat space and the indoor air of the ground building to each other.

The ground heat utilization cooling and heating system of the present invention 5 according to the present invention 1 to 4,
The outer wall member is an iron plate.

The ground heat utilization cooling and heating system of the present invention 6 is the present invention 1 to 4,
The intermediate wall member is made of a shaped steel material.

The ground heat utilization air conditioning system of this invention 7 in this invention 1 to 3,
The ground structure has an air passage through which air can pass under the floor.

The ground heat utilization cooling and heating system of the present invention 8 in the present invention 2,
The underground heat exchange member is in contact with the outer wall member via a steel heat transfer member.

  The ground heat utilization cooling and heating system of the present invention 9 is characterized in that, in the present invention 2, the underground heat exchange member has a function of a mountain retaining member.

The ground heat utilization cooling and heating system of the present invention 10 according to the present invention 4,
A heat medium pipe connected to a heat pump and circulating the heat medium is disposed in the underground heat space.

The ground heat utilization cooling and heating system of the present invention 11 is the present invention 6,
The shape steel material is characterized in that a through hole for allowing air to meander and circulate in the underground heat space is provided between opposing steel materials.

The geothermal heat utilization cooling and heating system of the present invention 12 is the present invention 1 to 11,
The geothermal space is composed of a plurality of partitioned geothermal spaces that can be divided and sequentially switched.

The ground heat utilization cooling and heating system of the present invention 13
A structure comprising a ground structure constructed on the ground and an underground structure installed at or below a basement of the ground structure, forms a framework of the wall of the underground structure, and conducts heat. An intermediate wall member made of a high-rate material, provided on the ground side of the intermediate wall member, and provided on the opposite side of the ground of the intermediate wall member, an outer wall member for retaining the earth, and the underground An inner wall member constituting the wall surface of the building, a pile embedded around the ground side of the outer wall member, extending to a position below the underground building, and having a mountain retaining function, in the vicinity of the pile A first circulation conduit having a ground heat exchange tube for exchanging heat with the underground, and circulating the first circulating fluid, and cooling or heating in the above ground structure and / or underground structure Has a building-side heat exchange section for performing The second circulation fluid, which is provided between the second circulation conduit body through which the body circulates, the first circulation conduit body, and the second circulation conduit body and is higher or lower in temperature than the first circulation fluid. It consists of a heat pump that builds up.

The ground heat utilization cooling and heating system of the present invention 14 in the present invention 13,
The underground heat exchange tube is a U-shaped tube and is configured integrally with the pile.

The ground heat utilization cooling and heating system of the present invention 15 is the present invention 13 or 14,
A heat exchange tube protection member is provided on the ground side of the pile, and the underground heat exchange tube is provided in a space constituted by the pile and the heat exchange tube protection member, and the space and the ground The intermediate heat exchange tube is filled with a filler, and the pile and the underground heat exchange tube are integrally formed.

The ground heat utilization air conditioning system of the present invention 16 is the present invention 13 to 15,
The underground building is provided with a heat storage tank in which hot water created by the geothermal heat pump is stored.

  As described above, the present invention is a system in which an underground building based on a conventional construction method is provided with an underground air heating / cooling device. By effectively using the underground space provided on the outer wall side of the steel underground building as the underground heat space, the air conditioning system using underground heat was simplified and the cost was reduced. In addition, natural energy will be used effectively, and part of the air-conditioning energy normally used will be covered, contributing to the reduction of energy consumption.

  In addition, a structure that uses piles with underground heat exchange tubes and piles for underground mounting is used to build underground heat exchange wells by driving a pile for underground construction into a pile with an underground heat exchange tube. No need for construction. In other words, the pile for piles and the underground heat exchange tube are embedded in one piece, so there is no need to dig a separate hole for burying the underground heat exchange tube, etc. Can be constructed. For this reason, it is possible to significantly reduce the cost of installing the underground heat exchange well, which has been a hindrance to the spread of the heat pump system that uses geothermal heat, and it is also underground in ordinary residential buildings (for example, detached houses). Heat-use heat pump system can be popularized.

  Furthermore, if it is set as the structure which installs a thermal storage tank in an underground building, even with a small heat pump, an above-ground building and an underground building can be air-conditioned, and an economic effect is large. In this configuration, the heat pump can be operated by using nighttime power, and the energy saving effect can be further promoted.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a geothermal utilization cooling / heating system according to the present invention will be described with reference to the drawings. 1-4 is typically shown in the block diagram which applied to a common house (building) and installed the system regarding this invention in the underground. 5 to 7 are sectional views partially showing the configuration as a detailed view. FIG. 5 is a plan sectional view, FIG. 6 is a sectional view taken along line XX in FIG. 5, and FIG. 7 is a sectional view taken along line YY in FIG. is there. FIG. 8 is an explanatory diagram showing an example of a divided configuration of the underground heat space.

  The house shown in this embodiment has a two-story structure, but is usually constructed as a ground structure 1 on a concrete foundation on the ground. Under the foundation, for example, if the ground is weak, piles are struck to strengthen the ground. Recently, there are many examples of providing a basement in a general house. For example, an underground building 2 is provided immediately below the ground building 1. The present invention is an air conditioning system using geothermal heat suitable for a house having such an underground building 2.

  The construction of the underground building 2 is performed by a construction method in which all the outer walls are concrete walls, or a construction method in which a steel material is provided on the outer walls and the side walls are surrounded by iron plates or concrete. The form of using geothermal heat according to the present invention can be applied to any building regardless of whether there is a basement of the ground building 1, and in particular, a basement having a basement directly under the ground building 1. It demonstrates as what applies to the building 2. FIG. The present embodiment is a geothermal heating and cooling system using underground heat in an underground building 2 having a basement and an outer wall partitioned by steel. In general, the underground building 2 is provided directly under a house that is the above-ground building 1. This construction is performed simultaneously with the ground part. The ground structure may be a one-story house, a multi-storey structure, or the like.

[Embodiment 1]
The underground building 2 according to the first embodiment has a configuration in which the periphery is surrounded by a steel panel. The steel material panel is formed of an iron plate 15 that is an outer wall member and a first steel material 3 that is an intermediate wall member. In the underground building 2, a floor, a wall, and a ceiling are steel panels, and the steel panels are assembled. In addition, you may comprise an underground building by connecting a unit-shaped thing. The first steel material 3 is a framework made of a shaped steel material arranged vertically and horizontally on the steel material panel of the underground building 2. The shape steel material may be a structural steel material such as an H-shaped steel, an L-shaped steel, or a grooved steel. In the first embodiment, the first steel material 3 is partially provided with a through hole 40. The underground building 2 has a box shape, and surrounding outer walls and the like are framed by the first steel material 3 as described above.

  The steel plate (outer wall member) 15 of the underground building 2 and the ground side of the steel panel made of the first steel material 3 are driven with a second steel material 4 (for example, an H-shaped steel) that is an underground heat exchange member. . The second steel material 4 also has functions as a mountain retaining member and a soil retaining member, and functions to stabilize the underground structure 2, reinforce the ground, and prevent the excavated ground from collapsing. The provision of the pile-shaped second steel material 4 in the vicinity of the underground building 2 is for earth retaining to prevent the collapse of the ground, and also relates to the function of stabilizing the underground building 2 and the present invention. This is also to provide a function of underground heat exchange. That is, the 2nd steel material 4 has the function of the underground heat exchange member for heat exchange (heat collection, heat dissipation) with underground. As described above, the underground building 2 is surrounded by the framework of the first steel material 3, and is installed, for example, 3m underground.

  The underground building 2 has the first steel material 3 arranged on the outer wall as described above, and the inner side of the first steel material 3 is connected to the first steel material 3 as shown in FIGS. An inner wall to which urethane 7, gypsum board 8, etc. are attached via a wood base material 6 constitutes a basement space 9 of the basement. In addition, the member which comprises this inner wall is not limited to this, For example, the light base material etc. may be sufficient as the wood base material 6. FIG. The urethane 7 may be another heat insulating material, and the gypsum board 8 may be a veneer board or the like. An iron plate 15 is attached to the ground side of the first steel material 3. That is, the first steel material 3 is installed in a frame shape between the iron plate 15 and the wood base material 6, and a space portion is formed in the first steel material 3. This is ensured as a geothermal space 10 that takes in and retains underground heat as an underground space with the wood base material 6. Air is guided to the underground heat space 10 through the basement space 9.

  This underground heat space 10 is provided with a shielding member 5 such as glass wool at the opening so that air does not escape to the outside of the underground heat space, and is an air space with a constant and stable temperature. . On the other hand, on the ground side, the ground structure 1 is constructed in the upper part of the underground structure 2, and the air conditioning target is, for example, the air in the room of the ground structure 1. In FIG. 1 showing the first embodiment, the ground structure is a two-story house, but it may be a one-story house or a multi-story building. Nor.

  A plurality of second steel members 4 are driven around the outer wall of the underground building 2, and the depth of the tip of the second steel member 4 that is driven is 6 to 10 m from the ground. Therefore, the 2nd steel material 4 which is this pile is driven and embed | buried to the underground depth of the underground 3-7m in addition to the height 3m of the underground building 2. FIG. Although the second steel material is illustrated and described as an H-shaped steel in the present embodiment, it is needless to say that the second steel material may be a steel pipe or another shape steel material. Although the ground structure 1 is installed on the underground structure 2 having such a configuration, the main object of geothermal use is to be used for air conditioning of the ground structure 1.

  The steel panel made of the iron plate 15 and the first steel material 3 is extremely effective in heat exchange. Next, the feature will be described. One of them is that the heat exchange area can be increased as compared with the conventional case. In the use of underground heat, a steel pipe has been buried in the ground in both cases, such as a heat pump type and a direct heat exchange type. In this method, heat exchange is performed by bringing a heat medium such as water or air into contact with the inner surface of the steel pipe. Since the thermal conductivity of iron is about 84 W / (m · K) and the thermal conductivity of the formation is about 0.5 to 1 (W / m · K), the ratio can be 100 times. For this reason, in order to effectively use the thermal conductivity of iron, it is necessary to increase the surface area of the iron, conduct the underground heat, and save the animal heat.

For comparison with the prior art, using specific numbers, for example, assuming that 10 steel pipes having a diameter of 150 mm and a length of 10 m have been conventionally used, for example, a surface area effective for underground heat intake is about 47 m ^2. It is. On the other hand, in the present embodiment, the comparison is made with the same scale as the conventional one. If the steel panel for the outer wall of the basement, the steel panel for the floor are 5 m * 6 m, the depth is 3 m, the second steel material 4 is 150 * 150 mm, the length is 10 m, and the number is 24, the surface area is about 204 m ² . In this comparison, the surface area difference is about 4 times. The large surface area is extremely effective for ground heat collection, heat dissipation, and the like, as described above.

  The second feature is that the dehumidifying capacity is large. In summer, heat is exchanged through the outer wall of the basement and the base of the basement, and at the same time as this heat exchange, the first steel material 3 and the like are condensed. That is, when the humid air in summer enters the cold underground heat space 10, it becomes supersaturated and dew condensation occurs. This dehumidifies the air passing through the geothermal space 10. Since this air circulates in the ground structure 1, the air in the entire house is dehumidified as a result, and a comfortable and refreshing living environment can be created. On the other hand, in the winter season, water is accumulated at the bottom of the underground thermal space 10, and air that is cooler than water is allowed to pass above the accumulated water to evaporate the water. Increase air humidity.

  By humidifying the air in this way, drying of the air is prevented. Thus, by circulating and utilizing the air in the underground heat space for air conditioning, the system has functions such as dehumidification or drying prevention (humidification) in addition to the improvement of the original air conditioning function. Therefore, the construction such as attaching a heat insulating material which has been conventionally performed for this purpose becomes unnecessary, and it has a great effect also in the cost of the construction work of the building.

  Next, each form of the air conditioning will be described. As shown in FIG. 1, Embodiment 1 is a case where a heat pump device is used, and the ground structure 1 is provided with a heat pump device including a heat pump 11, an indoor heat exchanger 14, and the like. The geothermal space 10 and the second steel material (geothermal heat exchange member) 4 constitute a geothermal heat pump device that functions as a so-called geothermal heat exchange well. In other words, no special construction is required for constructing the underground heat exchange well. The heat pump is a commonly used heat pump. The heat pump 11 includes, for example, a compressor, a condenser, an expansion valve, an evaporator, and piping that connects them. This pipe is a pipe for circulating an intermediate heat medium that mainly performs heat exchange. The heat pump device is used as a device for cooling or heating the ground structure 1 via a heat medium.

Between this heat pump 11 and the underground heat space 10 provided along the outer wall of the underground building 2, an underground heat medium pipe 12 for circulating the first heat medium is provided. The underground heat medium pipe 12 is connected to the underground heat space pipe 10 in the underground heat space 10 through a meandering pipe arranged in a meandering state, or a coiled or finned pipe or the like. . The first heat medium circulates in the underground heat medium pipe 12, exchanges heat in the underground heat side heat exchange section, and collects heat from the underground side or dissipates heat to the underground side.
The heat pump 11 performs heat exchange between the first heat medium and the intermediate heat medium, the intermediate heat medium and the second heat medium, and cools or heats the second heat medium to a desired temperature.

  In addition, a first air conditioner for circulating a second heat medium cooled or heated by the heat pump 11 between the heat pump 11 and the indoor heat exchangers 14 and 14 a provided in the room of the ground building 1. A side heat medium pipe 13 and a second air conditioner side heat medium pipe 13a are provided. The indoor heat exchangers 14 and 14a are provided with indoor heat exchangers, which exchange heat between the second heat medium and the indoor air to cool or heat the room. The indoor heat exchangers 14 and 14a are devices corresponding to indoor units such as an air conditioner (so-called air conditioner) commercially available for home use.

  The indoor heat exchanger 14 is provided at a necessary place, and is cooled by the heat pump 11 by the first air conditioning side medium pipe 13 and the second air conditioning side medium pipe 13a arranged on the side wall of the ground structure 1 or The heat of the heated second heat medium is received and heat exchange with indoor air is performed. The heat-exchanged second heat medium returns to the heat pump 11 again through piping such as the first air-conditioning side medium pipe 13 and the second air-conditioning side medium pipe 13a13a, and again reaches a predetermined temperature and is led to the indoor heat exchangers 14 and 14a. Then, heat exchange is performed to circulate and bring the indoor air to a predetermined temperature.

  Further, as described above, the underground building 2 is installed at a position of about 3 m below the ground, but the second steel material 4 is driven into the underground side around the outer wall of the underground building 2. The second steel material 4 also has a function as a pile. In addition to the height of the underground building 2 of 3 m, the second steel material 4 is driven over the underground 3 to 7 m. The second steel material 4 is combined with the first steel material 3 of the underground building 2. As for the coupling form, the steel materials are in contact with each other via the iron plate 15 constituting the earth retaining wall and the mountain retaining wall and the heat transfer member 16 which is a steel material. For this reason, heat conduction is performed smoothly.

  There is a gap between the second steel material 4 and the iron plate 15, and concrete 17 is usually placed. In this gap, backfill concrete, soil, or the like may be backfilled. In the first embodiment, as described above, the second steel material 4 and the first steel material 3 of the underground building 2 are coupled to both the heat transfer member 16 and the iron plate 15 via the steel material. There may be a space around the heat transfer member. Steel is a metal with high thermal conductivity. Accordingly, the underground heat is transmitted to the first steel material 3 of the underground building 2 through the second steel material 4, the heat transfer member 16, and the iron plate 15. The temperature of the air in the underground heat space 10 is described as the underground heat temperature, for example, 15 ° C. in the present embodiment. The normal underground temperature is stable at about 15-20 ° C at 3m underground, and is based on actual results.

  Since the underground heat space 10 is a closed space, it will be described as a space that maintains a constant air temperature and that constantly maintains 15 ° C. As described above, the 15 ° C. is a steady temperature that is not affected by the temperature change on the ground as the underground temperature. That is, in the summer season, the first heat medium having a temperature of 15 ° C. or more is circulated from the ground side and is led to the underground heat side heat exchange part of the underground side heat medium pipe 12 in the underground heat space 10. In this case, heat exceeding 15 ° C. in the ground through the iron plate 15, the heat transfer member 16, and the second steel material 4 is dissipated to the ground as summer heat as indicated by the arrows in the figure. One heating medium maintains 15 ° C. The underground has a very large heat capacity, and the underground temperature hardly changes due to this heat dissipation.

  On the contrary, in the winter season, the first heat medium having a temperature of 15 ° C. or less is circulated from the ground side and is led to the underground heat side heat exchange part of the underground side heat medium pipe 12 in the underground heat space 10. . In this case, the ground heat is collected from the ground side as the winter heat collection as shown by the arrow in the figure on the contrary through the second steel material 4, the heat transfer member 16, and the iron plate 15, and the first heat medium has a temperature of 15 ° C. maintain. In particular, a plurality of second steel materials 4 are embedded, the surface area thereof is large, and heat conduction with the underground side is easy. For this reason, the underground heat temperature of the underground heat space 10 is substantially the same as the underground temperature, and even if heat is radiated from the first heat medium and heat is collected to the first heat medium, the temperature is short. It can be maintained.

  For example, in the case of cooling in summer, assuming that the indoor air temperature is 30 ° C. and the underground temperature is 15 ° C., the first heat medium of the underground heat-side medium pipe 12 disposed between the underground hollows is 15 ° C. And is taken into the heat pump 11. The set temperature on the heat pump 11 side required for cooling is set to 7 ° C., for example. The first heat medium and the second heat medium exchange heat, the second heat medium approaches 15 ° C., and the first heat medium rises by a predetermined temperature. The first heat medium whose temperature has risen returns to the underground heat space 10 side and dissipates heat, and becomes substantially equal to the underground temperature.

  According to this temperature setting, the heat pump 11 operates by circulating the second heat medium for cooling, cools the second heat medium at 15 ° C., and converts the second heat medium at 7 ° C. to the indoor heat exchangers 14 and 14a. Circulate to the side to exchange heat with indoor air. The temperature of the indoor air decreases and the temperature of the second heat medium increases. At this time, in order to set the second heat medium at 15 ° C. to 7 ° C., the cooling energy of 15−7 = 8 ° C. is used. The second heat medium at 7 ° C. is guided to the indoor heat exchanger 14 through the air conditioning side medium pipe 13 to exchange heat with the indoor air, and the temperature of the indoor air is set to a predetermined cooling temperature. The second heat medium whose temperature has risen circulates to the heat pump 11 side and exchanges temperature with the first heat medium via the intermediate heat medium.

  If it is a general house, the indoor temperature is cooled from 30 ° C. to a predetermined cooling temperature, adjusted to a comfortable room temperature, and converted in temperature. In the case of a refrigerated warehouse that requires refrigeration, the temperature is set to a lower temperature. The indoor air receives this heat exchange for cooling and circulates in the room, gradually cooling the whole room. Therefore, in this case, in order to cool the summer ground temperature of 30 ° C. to 7 ° C. with the heat pump 11, the cooling energy of 30−7 = 23 ° C. is sufficient, and the cooling energy of 8 ° C. is sufficient. This means that the energy for 15 ° C has been saved.

For heating in winter, the device can be handled in the opposite way to summer. After the first heat medium having an underground temperature of 15 ° C. is taken into the heat pump 11 as described above, heat exchange with the second heat medium is performed via the intermediate heat medium. The set temperature of the heat pump 11 required for heating is set to 55 ° C., for example. The first heat medium and the second heat medium exchange heat, the second heat medium approaches 15 ° C., and the first heat medium drops by a predetermined temperature. The first heat medium that has fallen in temperature returns to the underground heat space 10 side to collect heat, and becomes substantially equal to the underground temperature. The heat pump 11 heats the second heat medium to 55 ° C., guides the heated second heat medium to the indoor heat exchangers 14 and 14a through the air conditioning side medium pipes 13 and 13a, exchanges heat with indoor air, and cools the room. The air is adjusted to a comfortable room temperature and converted.
According to this temperature setting, the heat pump 11 operates by circulating the second heat medium for heating, heats the heat medium at 15 ° C., and heats the second heat medium at 55 ° C. to the indoor heat exchangers 14 and 14a side. Circulate and exchange heat with indoor air.

  In this case, the heat pump 11 requires heating energy for 55−15 = 40 ° C. Therefore, when calculating according to the summer example, if the outdoor temperature in the winter is 5 ° C., the conventional heating energy for 55−5 = 50 ° C. may be the heating energy for 40 ° C. The energy for 10 ° C is saved. In the figure, a portion surrounded by a two-dot chain line indicates a partitioned underground thermal space configured by dividing an underground thermal space described later.

[Embodiment 2]
FIG. 2 is a configuration diagram showing a second embodiment in which the air blower is applied to the air conditioning system, although the basic configuration of the building including the ground building 1 and the underground building 2 is not different from that in FIG. This Embodiment 2 shows a simple air-conditioning configuration, and is an example in which air in a house is replaced with air in the ground, and an air blower, that is, fans 20 and 21 are used. In this case, since only air is circulated, fans 20 and 21 are provided in the middle of the circulation path. This system itself does not have an air conditioning control function for forcibly controlling to a predetermined temperature. In the configuration of the second embodiment shown in FIG. 2, fans 20 and 21 are provided in the air passage between the ground side and the underground side.

  Air is blown through the fans 20 and 21 through the ground side and the underground side. The air on the ground side is led through the basement space 9 to the underground heat space 10 through the fan 20 as shown by the arrow, and the air temperature becomes 15 ° C. and is led to the ground side again. Conversely, the air on the underground side is guided from the underground heat space 10 to the ground side via the fan 21 as shown by the arrow. For example, in the summer season, air of 30 ° C. is cooled to 30 ° C. or less by passing the underground thermal space 10 from the ground side by the fan 20, and is ideally discharged to the ground through the fan 21 as air having a temperature of 15 ° C. And released into the room. The air at 30 ° C. becomes air at a temperature of 15 ° C. and performs the cooling function.

  Similarly, in winter, outside air of 5 ° C. is led to the underground heat space 10 by the fan 20 to be air having a temperature of 5 ° C. or higher, and ideally, air having a temperature of 15 ° C. Release into the room. This fulfills the heating function. In the case of the second embodiment, only air is circulated. Although it is limited to a temperature range of around 15 ° C., the equipment for using the geothermal heat is only the fans 20 and 21 and the piping with respect to the geothermal space 10 and has a very simple configuration. In the second embodiment, the two fans 20 and 21 are used to circulate air indicated by arrows. Although it has a simple configuration, when a temperature above or below this underground temperature is required, a device such as a commercially available air conditioner may be supplementarily installed in a retrofitted form to provide air conditioning.

[Embodiment 3]
FIG. 3 is a configuration diagram illustrating the third embodiment. The third embodiment is a modification in which the first embodiment (see FIG. 1) and the second embodiment (see FIG. 2) are combined. The basic configuration of the building of the third embodiment is the same as that of the first and second embodiments. That is, this is a system in which the configuration in which the air in the underground heat space 10 and the ground air are circulated through the fans 20 and 21 is added to the configuration of the first embodiment (FIG. 1). In this case, the simple system shown in FIG. 2 can be forcibly air-conditioned at a predetermined temperature. The air conditioning side heat medium pipe 13 is arranged under the floor of each floor of the ground building 1, and indoor heat exchangers 14 and 14 a are provided on the opposite side of the heat pump 11. With the configuration shown in this figure, the cooling / heating-side heat medium pipe has an effect such as a so-called floor heating, and also has an effect that the rise time of the cooling / heating for achieving a predetermined cooling / heating temperature can be shortened.

[Embodiment 4]
The fourth embodiment is a modification in which an air passage 30 for circulating air is provided below the floor of the ground building 1 although the basic configuration of the building including the ground building 1 and the underground building 2 is not changed (FIG. 4). Moreover, the indoor heat exchanger 18 is provided in the vicinity of the heat pump 11, and no indoor heat exchanger is provided for each floor of the ground-side structure 1. The indoor heat exchanger exchanges heat between the second heat medium and air. This is a system in which air controlled to a predetermined temperature is guided by a fan 21 to an air passage 30 below the floor of the ground building 1 and released.

  The air that has passed through the air passage 30 under the floor is blown into the room to cool or heat each room. In this system, the air discharged from each room is led to the underground heat space 10 again by the fan 20 through the basement space 9. In the basement space 9, air controlled to a predetermined temperature is also blown out from the indoor heat exchanger 14a. This system does not simply cool and heat the room alone, but effectively uses the underground heat in consideration of floor cooling or floor heating and enables a comfortable indoor environment and one indoor heat exchanger. 18 is a system that enables cooling and heating of the ground-side building 1.

  In the summer season, the ground side heat is radiated (exhaust heat) into the ground, and the air cooled to a predetermined temperature by the heat pump 11 and the indoor heat exchanger 18 is sent to the air passage 30 and the room under the floor. It performs guiding and cooling functions. In the winter season, the ground side heat is collected (collected heat), and the air heated to a predetermined temperature by the heat pump device 11 and the indoor heat exchanger 18 is placed in the air passage 30 and the room under the floor. It performs the leading heating function.

  While various embodiments have been described above, any of the embodiments is an air-conditioning / heating system using geothermal heat based on the theoretical calculation described in the first embodiment.

Based on FIGS. 5-8, the geothermal space 10 is demonstrated further.
FIG. 7 is a cross-sectional view of FIG. 5 taken along line YY. That is, FIG. 7 shows a partial cross-sectional view of the underground thermal space 10 formed on the outer wall of the underground building 2. The H-shaped steel of the first steel material 3 is partially provided with through holes 40 so that air can freely move. The through hole 40 is illustrated as a round hole, but is not limited to this shape, and may be, for example, a square shape. Moreover, the structure which can move air freely with a clearance gap thing shall also be included. In this case, it is assumed that the wood base material 6 part is attached in a solid form with a plate-like material with no gap.

  Therefore, the air cannot move in the wood base material 6 portion, and can move between the H-shaped steels of the first steel material 3 only through the through hole 40. Through holes 40 are alternately provided above and below the H-shaped steel of the first steel material 3, and the air in the underground heat space 10 is H-shaped steel through the through-holes 40 on the inlet side as indicated by arrows. It passes through the enclosed space in a meandering manner and is led to the outlet side through hole 40 and moves through the geothermal space 10 divided one after another. The air in this example moves while evenly touching the entire iron plate 15 on the ground side wall surface. Therefore, the intake of geothermal heat is efficient, and the heat of geothermal heat can be obtained and maintained in a short time.

  FIG. 8 shows a modified example of the embodiment in which the underground heat space is divided into four sections and divided into underground heat spaces 51, 52, 53, and 54. Depending on the temperature on the ground side, the underground heat may not be maintained during the air circulation depending on the operation time. In consideration of this case, the underground thermal space 10 is divided into four, and the four partitioned underground thermal spaces 51, 52, 53, and 54 are sequentially switched and used. In the embodiment, the underground thermal space 10 is divided into four parts, but it is needless to say that the number is not limited.

  When the temperature for heat exchange reaches the limit as time passes by exchanging heat in the first subterranean heat space 51, switching is performed in the next subcompartment heat space 52. That is, in the summer season, when the temperature of the partition thermal space 51 used rises to 15 ° C or more and reaches the limit, and in the winter season, the temperature decreases to 15 ° C or less and reaches the limit. When this is done, the heat exchange is performed by switching to the next subterranean heat space 52 that maintains 15 ° C.

  By doing in this way, heat exchange is performed by sequentially switching the partitioned underground heat spaces 52, 53, and 54. When returning to the first section geothermal space 51, in the case of four sections, an unused time that is three times the geothermal use time in one section is generated in each section geothermal space. The temperature of the intermediate heat space is returned to 15 ° C. and maintained. In the present embodiment, this is one of the countermeasure examples due to the large surface area of the steel material effective for underground heat intake and large heat accumulation. By implementing this, geothermal heat can be utilized more effectively.

[Embodiment 5]
In the fifth embodiment, the basic configuration of the building including the ground building 1A and the underground building 2A is not changed, but the second steel material (pile for mountain retaining) 102 is exchanged with the ground (heat collection). This is a modified example in which a ground heat exchange tube (U tube) 106 that is a ground side heat exchanging portion that performs heat radiation is integrally provided. FIG. 9 is a configuration diagram schematically showing the configuration of the fifth embodiment of the geothermal heat-use air conditioning system of the present invention, and FIG. 10 is a configuration diagram schematically showing the configuration of the heat pump device in the fifth embodiment. It is. FIG. 11 is a cross-sectional view of FIG. 9 taken along line ZZ, and FIG. 12 is an external view partially showing the second steel material with the underground heat exchange tube (second steel material with the U tube). . FIG. 13 is a configuration diagram schematically showing the configuration of the heat pump device in a modification of the fifth embodiment.
The wall structure of the underground building 2A composed of an iron plate (outer wall member) 15, a first steel material (intermediate wall member) 3, a wood base material 6, urethane 7, gypsum board 8, and the like has been described above. This is the same as that of the first to fourth embodiments, and detailed description thereof is omitted.

The fifth embodiment will be described with reference to FIGS.
The second steel material (mounting pile) 102 is an H-shaped steel as in the embodiment described above. On the ground side of the second steel material 102, a tube protection member 103 made of equilateral angle steel is fixed by welding or the like. A space between the second steel material 102 and the tube protection member 103 is formed, and an underground heat exchange tube (hereinafter referred to as a U tube) 106 made of polypropylene is provided in this space. The U tube 106 is formed with a substantially U-shaped bent portion at the lower end side, and a portion corresponding to the length of the second steel material 102 of the U tube 106 is a ground heat side exchange portion. Further, the U tube 106 is integrally provided along the second steel material 102 and is configured to be shorter than the second steel material 102 by a predetermined length.

  The U tube 106 may be provided such that the outer peripheral portion is in contact with the second steel material 102 and / or the tube protection member 103. A space between the second steel material 102, the tube protection member 103, and the U tube 106 is filled with a filler (for example, mortar) 107. The second steel material (pile for mountain retaining) 102, the U tube 106, the tube protection member 103, the filler (mortar) 107, etc. are integrated into the second steel material with underground heat exchange tube (for mountain retaining with U tube). Stake) 100. This second steel material with underground heat exchange tube (pile for U-clamping with U tube) 100 is preferably manufactured in advance at a factory or the like and can be integrated into the ground.

  By comprising in this way, the U tube 106 can be embed | buried simultaneously at the process of driving in the 2nd steel material 102. FIG. That is, the excavation cost for the exchange well, the construction cost such as the U tube burying cost, and the construction period can be reduced, which is preferable. The second steel material 102 is a metal having high thermal conductivity. Therefore, the underground heat can be easily transmitted to the first circulating fluid 132 in the U tube 106 via the second steel material 102 and the like.

In addition, the U tube 106 should just be provided in all the 2nd steel materials 102 or several 2nd steel materials 102. FIG. The number of U tubes 106 to be installed may be appropriately determined based on the specifications of air conditioning in the ground building 1A and the underground building 2A. For example, when constructing the underground building 2A, about 26 pieces of the second steel material 102 having a length of 6 m are driven as a standard in order to dig a hole and retain the earth in the hole. When the U tube 106 is provided along the second steel material 102, a length sufficient to collect the underground heat can be obtained.
The U tube may be a tube made of other materials such as a synthetic resin such as polyethylene and vinyl chloride. Furthermore, the tube protection member may be formed of a steel material such as a grooved steel, a square pipe, or a round pipe.

A geothermal heat pump device having a U tube 106, a heat pump 101, and the like is a known device, but will be described with reference to FIG. 10 for easy understanding.
As shown in FIG. 10, the U tube 106 constitutes a part of the first circulation path body 130 in which the first circulating fluid 132 circulates between the underground heat side heat exchange section and the heat pump 101. . The first circulation path body 130 is provided with a first circulation pump 131, and the first circulation fluid 132 circulates in the first circulation path body 130. Thus, by continuously connecting the U tube 106, it is not necessary to dig a hole having a depth of 100 to 150 m and embed the U tube as in a conventional underground heat exchange well. The first circulating fluid 132 may be antifreeze, water, or the like.

  As described above, the heat pump 101 includes the compressor 121, the evaporator 122, the expansion valve 123, the condenser 124, and piping that connects them. An intermediate heat medium circulates through a heat medium circulation path 125 including a compressor 121, an evaporator (first heat exchange unit) 122, an expansion valve 123, a condenser (second heat exchange unit) 124, piping, and the like. The evaporator 122 is a part that performs heat exchange between the first circulating fluid 132 and the intermediate heat medium. The condenser 124 is a part that performs heat exchange between the intermediate heat medium and the second circulating fluid 117.

  In the heat medium circulation path 125, when it is used as a heat source for heating in winter (winter), an intermediate heat medium circulates in the direction indicated by the solid arrow. The evaporator 122 is a part that performs heat exchange between the first circulating fluid 132 and the intermediate heat medium. That is, the heat quantity of the first circulating fluid 132 circulating through the U tube 106 is transferred to the intermediate heat medium. The condenser 124 is a part that performs heat exchange between the intermediate heat medium and the second circulating fluid 117. That is, the heat amount of the intermediate heat medium is transferred to the second circulating fluid 117. The second circulating fluid 117 transferred by heat circulates in the second circulation pipes including the second circulation paths 111a, 112a, and 113a and the floor-side radiant cooling / heating type building-side heat exchange units 111b, 112b, and 113b, and is built. It is used as a heat source in the object-side heat exchange units 111b, 112b, and 113b. Note that the second circulating fluid 117 may be antifreeze, water, or the like.

  The first circulating fluid 132 that circulates in the U tube 106 provided integrally with the second steel material 102 is circulated by the first circulation pump 131. The first circulating fluid 132 performs heat exchange [heat collection (heat collection)] with the ground via the U tube 106 and the second steel material 102. The first circulating fluid 132 that has obtained heat by heat exchange becomes medium-temperature water and passes through the evaporator 122 of the heat pump 101.

  The first circulating fluid 132 exchanges heat with the intermediate heat medium in the evaporator 122, returns to the U tube 106 side as low-temperature water, and exchanges heat with the ground via the second steel material 102 and the like. Do. In the evaporator 122, the intermediate heat medium that has exchanged heat with the first circulating fluid 132 is further heated by being compressed in the compressor 121, and is sent to the condenser 124.

  In the condenser 124, the intermediate heat medium exchanges heat with the second circulating fluid 117. The second circulating fluid 117 that exchanges heat with the intermediate heat medium and obtains heat becomes hot water, circulates to the building-side heat exchange units 111b, 112b, and 113b and is used as a heat source for heating. The second circulation pump 116 is for circulating the second circulation fluid 117.

  On the other hand, when it is used as a heat source for cooling in summer, the intermediate heat medium circulates in the direction of the arrow indicated by the broken line in FIG. When the first circulating fluid 132 passes through the U tube 106, the first circulating fluid 132 exchanges heat (dissipates heat) with the ground at a temperature lower than the outside air temperature, and becomes the first circulating fluid 132 at a low temperature. The intermediate heat medium that has exchanged heat with the first circulating fluid 132 is cooled and depressurized by the expansion valve 123, so that the temperature is further lowered and sent to the condenser 124. Here, the low-temperature intermediate heat medium exchanges heat with the second circulating fluid 117 in the condenser 124. The second circulating fluid 117 having a low temperature is circulated to the building-side heat exchange units 111b, 112b, and 113b and used as a heat source for cooling.

  In the ground building 1A and the underground building 2A, the first floor in which a circulation path (building-side heat exchange unit) for flowing the second circulating fluid 117 is formed on the floor of each floor for the floor radiant cooling and heating system. A panel 111, a second floor panel 112, and a third floor panel 113 are provided. The first floor panel 111, the second floor panel 112, and the third floor panel 113 dissipate heat for heating in the winter, and the indoor temperature is set to a desired temperature as so-called floor heating. In addition, the first floor panel 111, the second floor panel 112, and the third floor panel 113 absorb indoor heat and set the indoor temperature to a desired temperature in summer.

  In addition, it cannot be overemphasized that the building side heat exchange part may be not a floor radiant cooling and heating type but an indoor heat exchanger as described above. Moreover, you may provide the heat-transfer member which is steel materials as above-mentioned in Embodiment 1 etc. between the 2nd steel materials (pile for mountain retaining) and an iron plate (outer wall member). Heat conduction between the iron plate 15, the heat transfer member, and the second steel material (mounting pile) 102 is facilitated. That is, heat exchange between the underground and the first circulating fluid 132 in the U tube 106 is facilitated.

  A modification of the fifth embodiment will be described with reference to FIG. In this form, a heat storage tank 108 is provided at one corner of the underground building 2A. That is, it is preferable to install a panel or the like at one corner of the underground building 2A and put the heat storage tank 108 in the inside (see FIG. 9). The heat storage tank 108 stores cold water in the summer and hot water in the winter. As the heat storage tank 108, for example, a balloon-shaped water tank can be used. And by cooling the cold water or warm water with the 3rd circulation pump 119, the ground building 1A and the underground building 2A are air-conditioned.

Since the geothermal air conditioning system having such a heat storage tank 108 stores cold water or hot water over time, the capacity of the heat pump 101 is compared with that of a non-thermal storage type geothermal air conditioning system. Can be small. In other words, a small heat pump can exhibit the same cooling and heating capability as before.
In addition, it is preferable to operate the heat pump 11 using night power (midnight power) because power costs can be reduced.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. Needless to say, modifications can be made without departing from the spirit and purpose of the present invention. For example, the geothermal space is a space composed of the first steel material of the outer wall of the underground building, but this geothermal space is connected to the ground near the second steel material provided on the ground side of the iron plate of the first steel material. It may be a space including a space. For example, a structure may be adopted in which holes are partially provided in the iron plate and air in the space on the ground side is taken into the steel material panel side.

FIG. 1 is a configuration diagram schematically showing the configuration of the first embodiment of the underground heat utilization cooling and heating system of the present invention. FIG. 2 is a configuration diagram schematically showing the configuration of the second embodiment of the underground heat utilization cooling and heating system of the present invention. FIG. 3 is a configuration diagram schematically showing the configuration of the third embodiment of the underground heat utilization cooling and heating system of the present invention. FIG. 4 is a configuration diagram schematically showing the configuration of the fourth embodiment of the underground heat utilization cooling and heating system of the present invention. FIG. 5 is a plan cross-sectional view partially showing details of the underground heat utilization cooling and heating system. 6 is a cross-sectional view of FIG. 5 taken along line XX. FIG. 7 is a cross-sectional view of FIG. 5 taken along line YY. FIG. 8 is an explanatory diagram of a configuration in which the underground heat space for capturing the underground heat is divided. FIG. 9 is a configuration diagram schematically showing the configuration of the fifth embodiment of the geothermal utilization cooling / heating system of the present invention. FIG. 10 is a configuration diagram schematically showing the configuration of the heat pump apparatus in the fifth embodiment. FIG. 11 is a cross-sectional view of FIG. 9 taken along the line ZZ. FIG. 12 is an external view partially showing the second steel material with underground heat exchange tube (pile for mountain retaining with U tube). FIG. 13 is a configuration diagram schematically showing the configuration of the heat pump device in a modification of the fifth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ground building 2 ... Underground building 3 ... 1st steel material (intermediate wall member)
4 ... 2nd steel (Ground heat exchange member)
DESCRIPTION OF SYMBOLS 5 ... Shielding member 6 ... Wood base material 7 ... Urethane 8 ... Gypsum board 9 ... Basement space 10 ... Underground heat space 11, 101 ... Heat pump 12 ... Underground heat side medium pipes 13, 13a ... Air conditioning side medium pipes 14, 14a ... Indoor heat exchanger 15 ... Iron plate (outer wall member)
16 ... Heat transfer member 17 ... Concrete 18 ... Indoor heat exchanger 20 ... Fan 21 ... Fan 30 ... Air passage 40 ... Through hole 51, 52, 53, 54 ... Subdivision heat space 104 ... Second steel material (pile)
106 ... Ground heat exchange tube (U tube)
111, 112, 113 ... floor panel

Claims (16)

In a building composed of a ground building (1) built on the ground and an underground building (2) installed in a basement directly below or near the ground building,
An intermediate wall member (3) comprising a frame of the wall of the underground building (2) and made of a material having high thermal conductivity;
An outer wall member (15) which is provided on the ground side of the intermediate wall member (3), holds the ground of the ground and can conduct heat from the ground side;
Inner wall members (6, 7, 8) that are provided on the opposite side of the ground of the intermediate wall member (3) and constitute the wall surface of the underground building,
A geothermal space (10) that is formed between the outer wall member and the inner wall member with the intermediate wall member (3) interposed therebetween and retains air having a temperature substantially equal to the underground temperature in the vicinity of the outer wall member. When,
An air heat exchanger (11, 20, 21) for cooling or heating the building using the difference between the temperature of the air in the underground heat space (10) and the temperature of the outside air. Air-conditioning system using geothermal heat. In the geothermal utilization air-conditioning system of Claim 1,
Around the ground side of the outer wall member (15) is a ground that can contact the outer wall member and extends to a position below the underground building, and is made of a material having high thermal conductivity. A ground heat utilization air conditioning system, characterized in that a medium heat exchange member (4) is embedded. In the geothermal utilization cooling and heating system according to claim 1 or 2,
The air heat exchange device (11) is a heat pump device that uses geothermal heat to cool or heat the interior of the building using the geothermal space (10) as a geothermal heat exchange well. Air-conditioning system using geothermal heat. In the geothermal utilization cooling and heating system according to claim 1 or 2,
The air heat exchange device (20, 21) is a blower that moves the air in the underground heat space (10) and the indoor air of the ground building (1) to each other. Air conditioning system. In the ground-heat utilization cooling and heating system of any one of Claim 1 to 4,
The outer wall member (15) is an iron plate. In the ground-heat utilization cooling and heating system of any one of Claim 1 to 4,
The said intermediate wall member (3) is comprised with the shape steel material. The underground heat utilization air conditioning system characterized by the above-mentioned. In the geothermal utilization cooling and heating system according to any one of claims 1 to 3,
The ground building has an air passage (30) through which air can pass under the floor. In the geothermal utilization cooling and heating system according to claim 2,
The underground heat exchange member (4) is in contact with the outer wall member (15) via a steel heat transfer member (16). In the geothermal utilization cooling and heating system according to claim 2,
The geothermal heat exchange member (4) is provided with a function of a mountain retaining member. In the geothermal utilization air conditioning system of Claim 4,
A heat medium pipe (12) connected to a heat pump and circulating a heat medium is disposed in the underground heat space (10). In the geothermal utilization air-conditioning system of Claim 6,
The shape steel material has a structure in which a through hole (40) for allowing air to meanderly circulate in the underground heat space (10) between the opposite shape steel materials is provided. Use air conditioning system. In the geothermal utilization air-conditioning system described in any one of Claims 1-11,
The underground heat space (10) is composed of a plurality of partitioned underground heat spaces (51, 52, 53, 54) that can be divided and sequentially switched. . In a building composed of a ground building (1A) built on the ground and an underground building (2A) installed in a basement directly below or near the ground building,
An intermediate wall member made of a material having a high thermal conductivity, forming a framework of the wall of the underground building (2A);
An outer wall member (15) provided on the ground side of the intermediate wall member and retaining the ground;
An inner wall member provided on the opposite side of the ground of the intermediate wall member, and constituting a wall surface of the underground building;
A pile (102) that is embedded around the ground side of the outer wall member (15), extends to a position below the underground building, and has a mountain retaining function;
A first circulation pipe body (130) embedded in the vicinity of the pile (102) and having an underground heat exchange tube (106) for exchanging heat with the underground, and circulating a first circulating fluid;
A second circulation conduit (111a, 112a, 113a) having a building-side heat exchange unit for cooling or heating in the above ground building and / or underground building, and through which the second circulating fluid circulates; ,
A ground pump comprising a heat pump (101) provided between the first circulation conduit and the second circulation conduit and creating the second circulation fluid at a higher or lower temperature than the first circulation fluid. Heat-use air conditioning system. In the geothermal utilization air-conditioning system described in Claim 13,
The geothermal heat exchange tube is a U-shaped tube, and is configured integrally with the pile. In the geothermal utilization cooling and heating system according to claim 13 or 14,
A heat exchange tube protection member (103) is provided on the ground side of the pile,
In the space constituted by the pile and the heat exchange tube protection member, the underground heat exchange tube (106) is provided,
The space and the underground heat exchange tube (106) are filled with a filler (107), and the pile and the underground heat exchange tube are integrally formed. Heat-use air conditioning system. In the geothermal utilization air conditioning system described in any one of Claim 13 to 15,
The underground building (2A) is provided with a heat storage tank in which hot water created by the geothermal heat pump is stored.

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